sleeping vs activity

sleeping and activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
sleeping	Yes	Yes	No	No
activity	Yes	No	No	No

As nouns, activity is a hypernym of sleeping; that is, activity is a word with a broader meaning than sleeping:

Other hypernyms of sleeping include bodily function, bodily process, body process.

sleeping (noun)	activity (noun)
the suspension of consciousness and decrease in metabolic rate	any specific behavior
quiet and inactive restfulness	the trait of being active; moving or acting rapidly and energetically
the state of being asleep	an organic process that takes place in the body
	a process existing in or produced by nature (rather than by the intent of human beings)
	the state of being active
	(chemistry) the capacity of a substance to take part in a chemical reaction

sleeping (adjective)	activity (adjective)
lying with head on paws as if sleeping